Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 61
Commutator is the name applied to the four blocks A, B, X and R taken together. By placing plugs in one diagonal or the other (fig. 53 or fig. 54) the two bridge arms are trans- Aposed, with reference to one another, so that if in one case X=—^jj in the other it will be X = ^r—R- (This may be… … Fig. 5:..
Electric apparatus and appliances · Equipment and supplies
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-911-409.webp)
